Lexmark 15W0335 User's Guide - Page 133
Theory of operation
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23 Theory of operation By understanding how the toner cartridges, photo developer cartridge, transfer drum, transfer roller, and fuser interact you can understand why problems occur and how to correct or prevent them. Output tray Photo developer cartridge Fuser Toner cartridges Transfer roller Laser emitter Transfer drum Photo developer charger Paper trays The green film inside the photo developer is a belt that makes a continuous loop as your printer operates. The photo developer charger (the thin wire on the bottom of the photo devleoper), places a uniform negative charge on the surface of the green film (photo developer media) as the media travels past the photo developer charger. As the media moves toward the toner cartridges it passes the laser emitter inside your printer. The information you send to your printer is changed into a laser-emitted signal. This signal is projected onto the photo developer media and discharges portions of the media. The discharged areas on the photo developer media pull negatively charged toner particles from the toner cartridges into the discharged areas on the photo developer media. As the photo developer media rotates, it meets the transfer drum. The transfer drum has a uniform neutral charge on it. When the transfer drum and photo developer meet, the image on the photo developer media moves from the media onto the transfer drum. As the transfer drum rotates toward the rear of the printer, the paper is pulled from the paper tray and travels up the paper path to meet your image. The paper or other media (such as transparencies or envelopes), arrives at the transfer roller and transfer drum just prior to your image. 133